Controller for electronic power steering apparatus

a technology of electric power steering and controller, which is applied in the direction of steering initiation, instruments, vessel construction, etc., can solve the problems of increasing the cost of the apparatus, affecting the proper control of the electric power steering apparatus, and being unable to identify fault parts,

Inactive Publication Date: 2007-08-16
NSK LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the electric power steering apparatus that performs the fault diagnosis as described in the Patent Reference 1 mentioned above employs a system of dual controllers each comprising a CPU and the like, it involves a problem that the cost of the apparatus increases.
Furthermore, another problem lies in that it is impossible to identify a fault part, i.e., to identify which an A/D converter, which...

Method used

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  • Controller for electronic power steering apparatus
  • Controller for electronic power steering apparatus
  • Controller for electronic power steering apparatus

Examples

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Embodiment Construction

[0017] An embodiment of the present invention will be described with reference to FIGS. 3 to 6. FIG. 3 shows a block configuration diagram showing hardware components of the embodiment.

[0018] In FIG. 3, a main micro controller unit (MCU) 10 and a sub MCU 20 are connected to each other such that they can communicate. The main MCU 10 comprises an A / D converter 11 associated with the main MCU 10. The A / D converter 11 has eight ports AD11-1, AD11-2, . . . , AD11-8. For example, the port AD11-8 is used for the fault diagnosis and the remaining seven ports from AD11-1 through AD11-7 are not used for the fault diagnosis but control an electric power steering apparatus itself. A main MCU 10 further comprises a CPU 12, a ROM 13 and a RAM 14, both of which are connected to the CPU 12.

[0019] On the other hand, the sub MCU 20 comprises an A / D converter 21 associated with the sub MCU 20. The A / D converter 21 has eight ports AD21-1, AD21-2, . . . , AD21-8. For example, the port AD21-8 is used f...

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Abstract

A controller of an electrically driven power steering apparatus that can be realized by using a low-cost structure to perform a fault diagnosis of A/D converters and that can determine a fault part, for example, which one of the A/D converters is in a fault state to determine whether the application of a steering assist force should be stopped or continued, with the result that the fault diagnosis places no excessive load on a main MCU. A main MCU with an A/D converter (1), a sub MCU with an A/D converter (2), and a D/A converter are provided. The sub MCU outputs a predetermined value to a D/A converter. An error between a predetermined value and a return value (1) obtained by transmitting a predetermined value to the sub MCU through a D/A converter and A/D converter (1) are compared in the sub MCU. An error between a predetermined value and a return value (2) obtained by transmitting a predetermined value to the sub MCU through a D/A converter and A/D converter (2) are compared in the sub MCU to perform the fault diagnosis.

Description

TECHNICAL FIELD [0001] The present invention relates to a controller for an electric power steering apparatus, and more particularly to a controller for an electric power steering apparatus wherein the controller can perform a fault diagnosis of an A / D converter and a D / A converter, which are used in the controller. Background Technique [0002] An electric power steering apparatus, which urges a steering apparatus of an automobile or a vehicle by means of a rotational force of a motor, imparts a driving force of the motor to a steering shaft or a rack axis through a transmission mechanism such as gears or a belt through reduction gears. Such a conventional electric power steering apparatus carries out a feedback control of a motor current in order to accurately generate an assist torque (a steering assist torque). The feedback control is to adjust a motor applied voltage to reduce the difference between a current command value and a motor current detection value. The motor applied vo...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D5/04H03M1/10
CPCB62D5/0481
Inventor FUKUDA, MASAHIRO
Owner NSK LTD
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